diff --git a/msba2-common/Makefile.include b/msba2-common/Makefile.include
index b8626464fc47032f36f5777104d128f1ce85ceca..082a2e57f1d9646e547e5c2de28acd2a8d6a5ad5 100644
--- a/msba2-common/Makefile.include
+++ b/msba2-common/Makefile.include
@@ -3,9 +3,10 @@ export CPU = lpc2387
 
 # toolchain config
 export PREFIX = @arm-none-eabi-
+#export PREFIX = @arm-elf-
 export CC = @$(PREFIX)gcc
 export AR = @$(PREFIX)ar
-export CFLAGS = -std=gnu99 -O2 -Wall -Wstrict-prototypes -mcpu=arm7tdmi-s -gdwarf-2
+export CFLAGS += -std=gnu99 -O2 -Wall -Wstrict-prototypes -mcpu=arm7tdmi-s -gdwarf-2
 export ASFLAGS = -gdwarf-2 -mcpu=arm7tdmi-s
 export AS = $(PREFIX)as
 export LINK = $(PREFIX)gcc
diff --git a/redbee-econotag/Makefile.include b/redbee-econotag/Makefile.include
index ee087fb78121e22c4fc1753713fa42e103bcce53..7275c2daf660ca33ccf982d315533ab59f025791 100644
--- a/redbee-econotag/Makefile.include
+++ b/redbee-econotag/Makefile.include
@@ -5,7 +5,7 @@ export CPU = mc1322x
 export PREFIX = @arm-none-eabi-
 export CC = @$(PREFIX)gcc
 export AR = @$(PREFIX)ar
-export CFLAGS = -std=gnu99 -march=armv4t -mtune=arm7tdmi-s -mlong-calls \
+export CFLAGS += -std=gnu99 -march=armv4t -mtune=arm7tdmi-s -mlong-calls \
 		-msoft-float -mthumb-interwork -fno-strict-aliasing -fno-common \
 		-ffixed-r8 -ffunction-sections -ffreestanding -fno-builtin \
 		-nodefaultlibs -Wcast-align -Wall -Wstrict-prototypes -Wextra \